Sky-Watcher Esprit 120mm ED Triplet APO Refractor
| Article number: | S11420 |
| Availability: | More on the Way to us |
| Delivery time: | More on the Way to Us |
Designed wtih the discerning astrophotographer in mind, Sky-Watcher USA’s top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more.
With their three-element air spaced objective lens design, false color is completely eliminated, yielding exceptional contrast and sharpness. The included 2-element field corrector guarantees a flat field across the entire imaging plane. The Sky-Watcher exclusive Helinear Track focusing system provides a smooth, rock-solid focuser with zero image shift.
All Sky-Watcher USA Esprit refractors come with a 9 x 50 right angle finderscope, 2-inch Star diagonal, 2-element field flattener*, camera adapter, D-style dovetail and padded case. Everything you need to get out under the stars.
- 120 mm apochromatic 3-element refractor
- 840 mm (f/7)
- Fully multi-coated
- Thread-on field flattener
- 3.0" focuser w/micro focus
- 2" Diagonal with dielectric coatings
- 9x50 RA erect-image finderscope
- Canon camera adapter
- Tube rings with CGE style dovetail bar
- Aluminum foam lined case
- 43mm image circle
- OTA Weight: 22lbs.
- OTA Length: 31.5" Extended and 27.375" Retracted
- Back focus: 75mm
| Optical Design | Refractor |
|---|---|
| Field Flattener | Included, thread-on |
| Aperture (mm) | 120 mm (4.72 in) |
| Focal Length | 840 mm (33 in) |
| Focal Ratio | 7 |
| Focal Length of Eyepiece 1 (mm) | No |
| Magnification of Eyepiece 1 | No |
| Focal Length of Eyepiece 2 (mm) | No |
| Magnification of Eyepiece 2 | No |
| Finderscope | 9x50, erect-image, right-angle |
| Diagonal | 2", dielectric coatings |
| Tube Rings | With 3" (CGE Style) dovetail plate |
| Mount Type | No |
| Saddle Type | No |
| Mounting Threads | No |
| Motor Drive | No |
| Tracking Rates | No |
| Power | No |
| Payload | No |
| Mount Weight | No |
| Highest Useful Magnification | 283 x |
| Lowest Useful Magnification | 17 x |
| Limiting Stellar Magnitude | 12.9 |
| Resolution (Rayleigh) | 1.16 arc seconds |
| Resolution (Dawes) | 0.97 arc seconds |
| Light Gathering Power (Compared to human eye) | 294 x |
| Optical Coatings | Fully multi-coated |
| Fully Illuminated Field | 43 mm (1.69 in) |
| Optical Tube Length | 30 in (762 mm) |
| Optical Tube Weight | 23 lbs (10 kg) |
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